Central Office of Information, London Correspondence regarding the publication of Kosterlitz's article on the 'History of the discovery of enkephalin and its possible physiological, pharmacological and therapeutic implications' in 'Spectrum', a publication of the Central Office of Information, May - September 1976. With annotated, typescript copies of Kosterlitz's text and back-copies of 'Spectrum' for 1976 (numbers 137 - 140). 1976